105840387 has 12 divisors (see below), whose sum is σ = 157012960. Its totient is φ = 68653008.

The previous prime is 105840367. The next prime is 105840391. The reversal of 105840387 is 783048501.

It is not a de Polignac number, because 105840387 - 2⁶ = 105840323 is a prime.

It is a super-2 number, since 2×105840387² = 22404375040619538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105840347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158587 + ... + 159252.

Almost surely, 2^105840387 is an apocalyptic number.

105840387 is a deficient number, since it is larger than the sum of its proper divisors (51172573).

105840387 is a wasteful number, since it uses less digits than its factorization.

105840387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317882 (or 317879 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 105840387 is about 10287.8757282541. The cubic root of 105840387 is about 473.0246863173.

Adding to 105840387 its reverse (783048501), we get a palindrome (888888888).

The spelling of 105840387 in words is "one hundred five million, eight hundred forty thousand, three hundred eighty-seven".